Fossils for Sale - High-quality BRITISH and WORLDWIDE Fossils. An impressive selection of fossils, including Ammonites, Trilobites, Belemnites, Fossil Fish, Fossil Shark Teeth, Fossilised Insects in Amber, Dinosaurs, and Reptiles. UK Fossils was formed in 1988 and collects and preps our own fossils in the heart of the Jurassic Coast, collecting fossils from Lyme Regis, Charmouth and Somerset. Our passion for fossils is reflected in our carefully curated collection, which includes some of the rarest and most unique specimens available.

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Rare 4" Fossil Ammonite Peronoceras fibulatum | Jurassic Lower Toarcian Somerset UK | Genuine + COA
Rare 4" Fossil Ammonite Peronoceras fibulatum | Jurassic Lower Toarcian Somerset UK | Genuine + COA - Image 2

Rare 4″ Fossil Ammonite Peronoceras fibulatum | Jurassic Lower Toarcian Somerset UK | Genuine + COA

£120.00

This listing features a rare and well-preserved 4-inch fossil ammonite, Peronoceras fibulatum, from the Lower Toarcian Stage of the Early Jurassic, collected in Somerset, United Kingdom. The photo shows the exact fossil specimen you will receive. Each cube in the scale image equals 1cm — please refer to the photo for full sizing.

This ammonite is a high-quality, scientifically valuable specimen, perfect for collectors, academic display, or paleontological study.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Geological & Scientific Information:

  • Fossil Type: Ammonite
  • Species: Peronoceras fibulatum
  • Order: Ammonitida
  • Superfamily: Hildoceratoidea
  • Family: Dactylioceratidae
  • Geological Stage: Lower Toarcian (approx. 182.7 – 174.1 million years ago)
  • Biozone: Falciferum Zone – specifically the Fibulatum Subzone
  • Period: Jurassic
  • Locality: Somerset, England, UK
  • Depositional Environment: Marine shelf, likely laid down under low-oxygen conditions during the early Toarcian Oceanic Anoxic Event (OAE); typical dark shales and calcareous muds

Morphology & Notable Features:

  • Strong, fibulate ribbing (looped/spined) across the flanks
  • Involute, compressed shell with dense ornamentation
  • Sharp venter with continuous ribbing
  • Classic of the genus Peronoceras, and the species fibulatum, known for its bold ribbing and diagnostic features for the subzone that bears its name

Scientific Significance:

Peronoceras fibulatum is a principal marker species for the Fibulatum Subzone of the Falciferum Biozone and plays a major role in dating and correlating marine sediments of the Early Jurassic. It is commonly studied in the context of the Toarcian Oceanic Anoxic Event (T-OAE), one of the most significant global environmental shifts of the Mesozoic.

This species was first described in 19th-century ammonite literature and continues to feature prominently in stratigraphic work throughout Europe.

Ideal For:

  • Fossil and ammonite collectors
  • Academic or university geology departments
  • Museum displays and curated exhibits
  • Biostratigraphic or paleoenvironmental reference material

What You Will Receive:

  • The exact Peronoceras fibulatum fossil shown in the images
  • Certificate of Authenticity
  • Secure, professional packaging for safe delivery

 

(Actual as seen)

Only 1 left in stock

SKU: UF4536 Category:

Description

This listing features a rare and well-preserved 4-inch fossil ammonite, Peronoceras fibulatum, from the Lower Toarcian Stage of the Early Jurassic, collected in Somerset, United Kingdom. The photo shows the exact fossil specimen you will receive. Each cube in the scale image equals 1cm — please refer to the photo for full sizing.

This ammonite is a high-quality, scientifically valuable specimen, perfect for collectors, academic display, or paleontological study.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

Geological & Scientific Information:

  • Fossil Type: Ammonite
  • Species: Peronoceras fibulatum
  • Order: Ammonitida
  • Superfamily: Hildoceratoidea
  • Family: Dactylioceratidae
  • Geological Stage: Lower Toarcian (approx. 182.7 – 174.1 million years ago)
  • Biozone: Falciferum Zone – specifically the Fibulatum Subzone
  • Period: Jurassic
  • Locality: Somerset, England, UK
  • Depositional Environment: Marine shelf, likely laid down under low-oxygen conditions during the early Toarcian Oceanic Anoxic Event (OAE); typical dark shales and calcareous muds

Morphology & Notable Features:

  • Strong, fibulate ribbing (looped/spined) across the flanks
  • Involute, compressed shell with dense ornamentation
  • Sharp venter with continuous ribbing
  • Classic of the genus Peronoceras, and the species fibulatum, known for its bold ribbing and diagnostic features for the subzone that bears its name

Scientific Significance:

Peronoceras fibulatum is a principal marker species for the Fibulatum Subzone of the Falciferum Biozone and plays a major role in dating and correlating marine sediments of the Early Jurassic. It is commonly studied in the context of the Toarcian Oceanic Anoxic Event (T-OAE), one of the most significant global environmental shifts of the Mesozoic.

This species was first described in 19th-century ammonite literature and continues to feature prominently in stratigraphic work throughout Europe.

Ideal For:

  • Fossil and ammonite collectors
  • Academic or university geology departments
  • Museum displays and curated exhibits
  • Biostratigraphic or paleoenvironmental reference material

What You Will Receive:

  • The exact Peronoceras fibulatum fossil shown in the images
  • Certificate of Authenticity
  • Secure, professional packaging for safe delivery

 

Additional information

Era

Jurassic
Origin

United Kingdom

Jurassic Information

The Jurassic Period (201–145 million years ago) was the golden age of dinosaurs, with iconic species like Brachiosaurus, Stegosaurus, and Allosaurus dominating the land. It was a time of warm, humid climates, with high sea levels that created vast shallow seas, supporting abundant marine reptiles, ammonites, and early coral reefs. The first birds, such as Archaeopteryx, evolved from small theropod dinosaurs, while early mammals remained small and nocturnal. Lush forests of cycads, conifers, and ferns covered the land, providing food for giant herbivores. The breakup of the supercontinent Pangaea accelerated, shaping Earth's geography and setting the stage for the diverse ecosystems of the Cretaceous.

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